int red1 = 13;
int yellow1 = 12;
int green1 = 14;

int red2 = 15;
int yellow2 = 2;
int green2 = 4;

int red3 = 16;
int yellow3 = 17;
int green3 = 5;

void setup() {
Serial.begin(115200);
pinMode(red1, OUTPUT);
pinMode(yellow1, OUTPUT);
pinMode(green1, OUTPUT);

pinMode(red2, OUTPUT);
pinMode(yellow2, OUTPUT);
pinMode(green2, OUTPUT);

pinMode(red3, OUTPUT);
pinMode(yellow3, OUTPUT);
pinMode(green3, OUTPUT);
}

void loop() {
digitalWrite(green1, HIGH);
digitalWrite(red2, HIGH);   
digitalWrite(red3, HIGH);
delay(20000);               

digitalWrite(green1, LOW);
digitalWrite(red2, LOW);
digitalWrite(yellow1, HIGH); 
digitalWrite(yellow2, HIGH);  
delay(5000);   

digitalWrite(yellow1, LOW); 
digitalWrite(yellow2, LOW);
digitalWrite(red1, HIGH);  
digitalWrite(green2, HIGH);
delay(20000);            

digitalWrite(green2, LOW);
digitalWrite(red3, LOW);
digitalWrite(yellow2, HIGH);
digitalWrite(yellow3, HIGH); 
delay(5000);  
  
digitalWrite(yellow2, LOW); 
digitalWrite(yellow3, LOW); 
digitalWrite(red2, HIGH);
digitalWrite(green3, HIGH); 
delay(20000);               

digitalWrite(red1, LOW);
digitalWrite(green3, LOW);
digitalWrite(yellow1, HIGH); 
digitalWrite(yellow3, HIGH); 
delay(5000);             

digitalWrite(yellow1, LOW); 
digitalWrite(yellow3, LOW);   
digitalWrite(green1, HIGH); 
digitalWrite(red3, HIGH); 
delay(20000);   
}